Of all accidents to employees the most numerous are those which arise in coupling and uncoupling cars. In Massachusetts, in 1888, the employees killed and injured were 391; of these casualties 154 occurred in coupling accidents. The commissioners of other States, especially of Iowa, have for years published statistics showing nearly the same ratio. Fortunately accidents of this class, although numerous, are not proportionately fatal. Far the greater part of them result in the loss of part of a hand; but they are so frequent as to have caused much discussion, legislation, and invention. Several States have, one time and another, passed laws requiring the use of automatic couplers; and two or three years ago there were on record in the United States over four thousand coupler patents. The laws have been futile because impracticable; and most of the patents have been worthless for the same reason. It was obvious that the business of supplying couplers for the one million freight cars of the country could not be put into the hands of some one patentee unless his device was manifestly and pre-eminently superior to all others. It became important, therefore, to select as a standard some type of coupler general enough to include the patents of various men, and at the same time so definite that all couplers made to conform to the standard could work together interchangeably. Those who read Mr. Voorhees' story[21] of the wanderings of a freight car will understand that any one freight car in the United States or Canada should be prepared to run in the same train with any other car. A few years ago a committee of the Master Car-builders' Association was appointed to choose and recommend a type of coupler to be adopted as the standard of the association. After prolonged and careful study of the subject, the committee recommended the type of which the Janney is the best known example, and that has now become the standard of the association. This action does not give a monopoly to the Janney company, as there are already half a dozen couplers which conform to the type. This coupler is shown by diagrams in the article by M. N. Forney, page 142. A perspective view is herewith given. This device couples automatically, and thus does away with the necessity for the brakeman going between the cars. It can also be unlocked by the rod shown extending to the side of the car, and the locking device can be set not to couple, to facilitate switching and yard work. The mechanical principles of this coupler are a great and important improvement upon any form of link-and-pin coupler; and the coupler question has now come to this point: A type of coupler has been selected by a technical body representing most of the railroads of the United States. It is general enough to avoid the evils of a patent monopoly. It promises to be economical in operation, and will certainly do away with the terrible loss of life and limb which results from the use of the non-automatic coupler.